Home / 1,555.70-2,146.85-857.07

Finding the Fourth Proportional to 1,555.70, 2,146.85 and 857.07

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Solution

The fourth proportional to 1,555.70, 2,146.85 and 857.07 is: 1,182.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,555.70 : 2,146.85 = 857.07 : x
  2. Step 2: Convert to fraction form
    1,555.70/2,146.85 = 857.07/x
  3. Step 3: Cross multiply
    1,555.70x = 2,146.85 × 857.07
  4. Step 4: Simplify right side
    1,555.70x = 1,839,996.44
  5. Step 5: Solve for x
    x = 1,839,996.44/1,555.70
  6. Step 6: Final answer
    x = 1,182.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.